The carbon combines with the oxygen to form the carbon dioxide
A. Element; compound;mixture
B. Compound; element; mixture
C. Element; element; compound
D. Compound; compound; element

Element, element, Compound.

Explanation:

The element carbon combine with element oxygen to form compound carbon dioxide.

Option c is correct because,

Carbon (C) and oxygen (O) are elements when they combine they produces CO₂. Carbon dioxide is a compound not a mixture, because the properties of carbon dioxide are different from element oxygen and carbon. If they retain their properties after reaction or combining CO₂ would be a mixture but actually its not happens. The properties of carbon dioxide are different.

Mixture:

When two or more substances combined through physical forces in such a way that they retained their properties the resultant substance is called mixture.

Compound:

When two or more substances chemically bonded together and form a compound which have different properties from constituents it is called compound.